What Are Casement Windows?

What Are Casement Windows

Casement windows are a popular and versatile window style characterised by their hinged design, which allows them to open outward from the side (or sometimes the top or bottom depending on the window style).

This unique opening mechanism provides an unobstructed view and maximises ventilation, setting them apart from traditional sash windows that slide and block part of the window space.

This design’s adaptability makes it suitable for various architectural styles, whether modern or traditional.

What Are The Different Types Of Casement Windows?

There are a few different types of casement windows and in this section we’ll explain some of the more popular ones:

Side-Hung Casement Windows

The most common variant is the side-hung casement window. These windows are hinged at the sides and open outward, providing excellent ventilation and ease of use.

They come in Timber, PVCu or aluminium. And you also have more colour options than you might expect, meaning you can get a window that truly matches your home.

This design is ideal for those seeking a classic look with practical functionality.

Top & Bottom-Hung Casements

As mentioned earlier, some casement windows are hung from the top or bottom. Let’s now take a look at each and when they’re commonly used:

  • Top-hung, also known as awning windows, open from the bottom and are ideal for wet climates. This is because the opening of a awning window is at the bottom, which stops the rain falling in or blowing through.
  • Bottom-hung, AKA “hopper windows”, open from the top and are suitable for higher floors. This is because the opening is at the top, making it safer.

Single & Double Casements

Single casement windows are characterised by their versatility in fitting into a singular frame, often accommodating panels of varying sizes and dimensions.

This adaptability makes them an excellent choice for a wide range of architectural styles and spaces. Whether it’s a quaint cottage or a modern apartment, single casements can be tailored to fit small, unusual, or particularly shaped openings.

Double casements aka French casement windows

Double casements, often referred to as “French casement windows”, are distinguished by their dual-panel design. They provide a significant advantage in terms of aesthetics and functionality – with no central stile to obstruct the view. These windows offer a panoramic and unobstructed view of the outdoors, making them an ideal choice for rooms that overlook gardens, landscapes, or urban vistas.

This feature not only enhances the visual appeal of a space but also allows more natural light to flood in, creating a brighter and more inviting environment.

Flush Casement Windows

Flush casement windows are designed to sit level with the frame, creating a clean and uniform exterior that is emblematic of contemporary architectural design. This seamless integration into the building’s facade offers a minimalist aesthetic that is highly sought after in modern construction.

The flush design not only enhances the visual appeal but also contributes to the aerodynamic profile of the building, reducing wind resistance and potentially improving energy efficiency.

Fixed Casement Windows/Picture Windows

Fixed casement windows, commonly known as “picture windows“, are characterised by their non-opening design. They are typically used as a central feature in a larger window installation, often flanked by operable windows.

This combination allows for the practicality of ventilation from the side windows while the fixed casement provides an uninterrupted view of the outdoors. The large, unobstructed glass surface of fixed casements maximises natural light and offers a panoramic view, making them an ideal choice for showcasing beautiful external landscapes or cityscapes.

Casement Windows

What Are The Benefits Of Casement Windows?

Here’s some of the key reasons they’re so popular:

Good For Energy Efficiency

Casement windows are known for their superior energy ratings due to tight seals that reduce air leakage, making them an eco-friendly choice that can save you a bit of money on your heating bills.

Lots Of Customisation Options

Available in various finishes and materials, including UPVC, aluminum and Timber – casement windows offer extensive customisation options to suit any property style.

And as we mentioned earlier, there’s lots of colour options for you to choose from too.

Better Security

Casement windows are renowned for their robust security features. They come equipped with strong, multi-point locking mechanisms that securely anchor the window to the frame when shut. This design significantly reduces the risk of forced entry, making them a reliable choice for home security.

Additionally, the option to include multiple panes of glass not only enhances insulation but also adds an extra layer of security. These features, combined with the sturdy construction typical of casement windows, provide homeowners with peace of mind, knowing their property is better protected against potential break-ins.


When it comes to cost-effectiveness, casement windows stand out due to their straightforward and efficient design. The simplicity of their mechanism — relying on hinges and fewer moving parts — means that they require less material and labour to manufacture compared to more intricate window styles.

This cost-saving advantage makes them an economical option without compromising on quality or functionality.

For homeowners and builders alike, casement windows offer an excellent balance between affordability and performance.

Low Maintenance

One of the most appealing features of casement windows is their ease of maintenance. Designed for convenience, their structure allows for easy access to both sides of the glass, simplifying the cleaning process.

This is particularly beneficial for windows on higher floors or in hard-to-reach places. Additionally, the durability of materials used in casement windows, such as UPVC, aluminum, and timber, ensures longevity and resistance to weather elements, reducing the need for frequent repairs or replacements. T

Considering Casement Windows?

If you’re considering about getting casement windows for your home, or you’d like to find out a bit more about them – get in touch with our team today.

We have a wide service area, covering: Suffolk, Norfolk, Cambridgeshire & North Essex.

SEE ALSO: What Are Sash Windows?


What is a casement in windows?

A casement in windows refers to the part of the window that is hinged and opens outward. In casement windows, this hinged casement can be positioned on the side, top, or bottom of the window frame, allowing for versatile opening methods and providing clear, unobstructed views.

Why are casement windows better?

Casement windows are considered better than certain other types due to their superior energy efficiency, resulting from tight seals that minimise air leakage. They also offer enhanced security with robust locking mechanisms, customisable options in materials and colours, and ease of maintenance, making them a practical and stylish choice for various architectural styles.

What is the difference between a casement window and a regular window?

The difference between a casement window and a regular window lies primarily in the opening mechanism. Casement windows are hinged at the side, top, or bottom and open outward, offering better ventilation and unobstructed views. Regular windows, such as traditional sash windows, typically slide up and down or side to side and may partially obstruct the window opening.

Are casement windows more energy efficient?

Yes, casement windows are more energy efficient. Their design allows for tight seals when closed, effectively reducing air leakage and improving insulation. This feature makes them an eco-friendly option that can lead to savings on heating and cooling costs.

Are casement windows burglar proof?

While no window can be completely burglar-proof, casement windows offer enhanced security features. They are equipped with strong locking mechanisms and the option for multiple panes of glass, making them more difficult to forcefully open from the outside compared to other window types.

Do casement windows open in or out?

Casement windows typically open outward. This outward opening mechanism, combined with their hinged design at the side, top, or bottom, allows for greater airflow and unobstructed views, distinguishing them from other window styles.

Are casement windows modern?

Casement windows are modern in terms of their design and functionality. They offer a contemporary look, especially in the flush casement style, which sits sleekly within the frame. Their energy efficiency, customisable options, and security features also align with modern standards for window design.

What is a casement picture window?

A Casement Picture Window is a type of window that features a large, fixed pane of glass, designed to provide an expansive and unobstructed view, similar to a picture frame. This window does not open, making it ideal for maximising natural light and enjoying outdoor views. Often found in living areas or spaces overlooking attractive landscapes, Casement Picture Windows are a popular choice for their aesthetic appeal and ability to seamlessly integrate with various architectural styles.